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Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Hi guys, I achieved to make photographs of Lichtenberg figures produced by my tesla coil. My coil (SSTC - 2.5KW of raw power) was discharging against a mirror producing these beautiful snowflakes like figures (more pictures are also here )
The funny thing is that lichtenbergs should be produced by DC discharges and you can even divide the types of the figures into positive and negative (more you can read here ).
Those produced with my AC TC looks all the same reminding the positive ones… How should I understand this? Shouldn’t be the probability of the two types of the figures the same in case of AC? I photographed at least 50 of them and all are the same…
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Dr. Kilovolt wrote ...
Sorry but to me it does not look like Lichtenberg, it looks like the classic fractal branching of TC arcs.
I don't want to argue but what does it mean "classic fractal branching..." ? I've been playing with a TC sparks already for some time and I've never seen something like this until now... Those figures are very likely lichtenbergs. They are produced on the surface of an isolator (glass) after being hit by the spark. There is conductive layer below the glass (it's a mirror) which works as ground. Thus the setup is exactly like for the lichtenbergs production...
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Dr. Kilovolt wrote ...
like this? you can clearly see similar branching.
No, you don't understand the photograph...my breakout point is not visible on the picture (it is like 30cm away). It is photograph of the place where the spark strikes. If there is something similar on the blog than it is the Dr.Spark avatar (unfortunately it is photographed from a bad ankle to see the lichtenberg figure properly)...
Add Dr.Spark's avatar (check the strike impact areas and imagine being photographed from top view)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
OK.. I think i know what you mean, you get the similar effect when you place two high voltage AC/pulsed DC electrodes on either side of a glass plate. (50hz effect @ ) I think this does not have to do much with Lichtenberg figures, they are made by firing electrons (I believe) at a few MeV into a plastic block.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Dr. Kilovolt wrote ...
....they are made by firing electrons (I believe) at a few MeV into a plastic block.
The orginal lichtenberg figures have nothing to do with MeV range particle accelerator and plastic blocks...
A very brief explanation (taken from here )
The discharge originates in intense ionisation of air molecules between the point electrode and the surface. Ultra-violet radiation produces ionisation of any adjacent molecule. This now is a conducting path and is self replicating outwards - more UV ionises another and so on and the figure develops as branches of current/ions which emit electromagnetic radiation (crackles on radios and light for the photograph). This continues until the stored electricity is depleted
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I think the streamers branching and lichenbern figures are essentially the same thing, just different applications... The streamers grow in essentially the same way as a normal lachenberg would, just using air instead of some other dialectric. The negative lichenberg figure would be that one that I would throw out as an oddball, since I don't really see how it could have formed by the process described above...
In any case, the streamers grow because they ionise the air (regardless of polarity...) which creates a conductor which allows you to ionise farther, etc.
BTW be careful linking images like that, their owners might not like them being published as a creative commons...
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Question about Lichtenberg figures polarity
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